import type { BookingValidationErrorCode, ValidationResult } from "@/services/scheduling/types";

/**
 * Maps the typed error codes the Phase 3 services already return into
 * customer-friendly copy. The only place raw codes get translated —
 * every booking-flow page imports from here rather than inlining its own
 * message strings, so the wording only needs to change in one place.
 */
const FRIENDLY_MESSAGES: Record<BookingValidationErrorCode, string> = {
  INVALID_INPUT: "Something about that wasn't quite right. Please try again.",
  NO_SERVICES_SELECTED: "Please select at least one service.",
  SERVICES_SPAN_MULTIPLE_BUSINESSES: "One or more selected services aren't available here.",
  STAFF_CANNOT_PERFORM_SERVICE: "This barber doesn't offer one of the selected services.",
  BUSINESS_CLOSED: "The business is closed at this time — please choose another slot.",
  BUSINESS_HOLIDAY: "The business is closed on that date — please choose another day.",
  STAFF_NOT_WORKING: "This barber isn't working at that time — please choose another slot or barber.",
  STAFF_ON_BREAK: "This barber is on a break at that time — please choose another slot.",
  STAFF_ON_LEAVE: "This barber is away on that date — please choose another barber or date.",
  SLOT_UNAVAILABLE: "That time was just booked by someone else — please choose another.",
  INSUFFICIENT_DURATION:
    "There isn't enough time left that day for the selected services — try an earlier time or fewer services.",
  BELOW_MIN_NOTICE: "This time is too soon — please choose a later time.",
  BEYOND_MAX_ADVANCE: "This date is too far ahead to book yet — please choose a nearer date.",
  BUSINESS_DAILY_LIMIT_REACHED: "This business is fully booked that day — please choose another date.",
  STAFF_DAILY_LIMIT_REACHED: "This barber is fully booked that day — please choose another barber or date.",
  APPOINTMENT_NOT_FOUND: "We couldn't find that appointment.",
  INVALID_STATUS_TRANSITION: "This appointment can no longer be changed.",
  STAFF_NOT_FOUND: "We couldn't find that barber.",
  CUSTOMER_NOT_FOUND: "We couldn't find your customer details.",
  BUSINESS_NOT_FOUND: "We couldn't find this business.",
};

const FALLBACK_MESSAGE = "Something went wrong with this booking. Please try again.";

export function getFriendlyMessage(code: BookingValidationErrorCode): string {
  return FRIENDLY_MESSAGES[code] ?? FALLBACK_MESSAGE;
}

export function getFriendlyValidationMessages(validation: ValidationResult): string[] {
  if (validation.issues.length === 0) return [];
  return validation.issues.map((issue) => getFriendlyMessage(issue.code));
}

export function getFirstFriendlyMessage(validation: ValidationResult): string {
  const [first] = validation.issues;
  return first ? getFriendlyMessage(first.code) : FALLBACK_MESSAGE;
}